APA
Okumu .B .Gladys, Mungania .R. Shadrach, Kiura .G. James, Jerotich Rosebella & Nyamweya .N. Humpden. (1989). KLB Secondary Biology. Nairobi: KLB.
Chicago
Okumu .B .Gladys, Mungania .R. Shadrach, Kiura .G. James, Jerotich Rosebella and Nyamweya .N. Humpden. 1989. KLB Secondary Biology. Nairobi: KLB.
Harvard
Okumu .B .Gladys, Mungania .R. Shadrach, Kiura .G. James, Jerotich Rosebella and Nyamweya .N. Humpden. (1989). KLB Secondary Biology. Nairobi: KLB.
MLA
Okumu .B .Gladys, Mungania .R. Shadrach, Kiura .G. James, Jerotich Rosebella and Nyamweya .N. Humpden. KLB Secondary Biology. Nairobi: KLB. 1989.